Patent GB-367804-A (GB)
Title: Improvements in and relating to paper-feeding mechanism for typewriter machines, typewriter-calculating and like machines
IPC: B41J11/36
Filed: 1930-11-24
Abstract: 367,804. Typewriters &c. BRYSON, W., 29, Southampton Buildings, London.- (Mercedes B³romaschinen-Werke Akt.-Ges. ; Benshausen, Mehlis, Zella, Thuringia, Germany.) Nov. 24, 1930, No. 35323. [Class 100 (iv).] Sheet and web feeding and guiding arrangements; feed-roller-rotation for blanking ; linespacing mechanism. -Paper - feeding means, operated on return of the carriage, comprises separate driving-members which are automatically operated at different points in the travel of the carriage. The mechanism may comprise web-feeding rollers operated for linespacing and blanking by separate driving- members, the line-spacing member only being operated after short lines, whereas the blanking- member also is operated after a full line, means being adjusted after each line-spacing operation for reducing by one line-space the feed that the blanking-member can impart. Releasable feedrollers may be provided for holding on the platen a wide record sheet which is fed by the usual line-spacing mechanism. The typewriteradding machine shown in Fig. 2 includes column-totalizers 7 and line-totalizers and is employed for filling in a series of bills, e.g. for gas, electricity, and water, and a corresponding record sheet. The platen frame 29 is provided with aprons 30l, 49, Fig. 3, for guiding a record sheet S, and a web F consisting of a series of separate bill forms around the platen 5. The record sheet is wider than the web and is engaged by feed-rollers 30g, 59, 60. The feedrollers 30g are mounted on spring-urged plates 30f hinged to laterally adjustable slides 30c. The feed-rollers 59, 60 are mounted on spindles 57, 58 carried at each end by an arm 56 formed with a notch 55, Fig. 5, which receives a pin 51 on pivoted yoke 52 resting on an adjustable spring 54, the pin engaging also a notch in a bell crank 46 which engages a cross-groove in a shaft 39 mounted on a cross-bar 30 of the platen frame. The apron 49 is pivoted at each end to a spring-urged bell crank 47 engaging a crossgroove in the shaft. When the shaft is rocked by means of a finger-lever 33, the apron 49 and feed-rollers 59, 60 are depressed and the apron 30l drops to the positions shown in Fig. 3 to permit of inserting the record sheet and the web. Each set of members 47, 46, 52 is arranged adjacently on a shaft 45 carried by a pair of brackets 44, 44a which are secured by screws to the cross-bar 30 and have lugs 44b for engaging grooves therein, the arrangement facilitating adjustment of the brackets when the feed-rollers are adjusted longitudinally. A shelf 70 for guiding the web after it leaves the platen is secured to a rod 68 and has a stiffening- plate secured to collars 65 loosely mounted on a shaft 64. Web-feeding rollers 73 on the shaft pass through slots in the shelf and co-operate with rollers 78 on a spring-urged bail 75. To permit of inserting the web, the bail is moved forwards to the position shown in Fig. 3, the platen frame having stops 82 for engaging pins 80 on the bail. A zig-zag web-pack is placed in a box 242, Fig. 2, which is connected by arms 245 to the carriage 4 and has a roller 243 running on a rail 241 supported by a bracket 238 on a part 87 of the framework 1. The web passes over a guide-plate 242a and between pairs 85, P of adjustable side-guides. The box is provided with adjustable side-guides 246 for the web, and has a part 242a for receiving the web from the platen. During the return of the carriage, the platen is rotated to line space the record sheet, and the feed-rollers 73 are rotated to line space and, if necessary, blank feed the web. The platen is rotated by the line-spacing mechanism Z, Fig. 2, this being preferably operated during the lost-motion movement of a rack 8 in connection with powermechanism for returning the carriage. The means for rotating the feed-rollers 73 consists of co-operating devices A, B mounted on the framework 87 and the carriage respectively. The device A comprises a plate 93 pivoted to a lug 90b, Fig. 13, and urged upwards by a spring 109, a projection 98 on the plate being normally confined between a lug 97 and a pivoted latch 102. A slide 121 mounted on the plate is formed with a rack 128 co-operating with a sliding pawl 137 and a pivoted detent 131. The pawl abuts on a lever 149 and has slots 139, 140 engaging pins on the plate, the slot 139 being so shaped that the pawls ride into engagement with the rack when the lever is rocked towards the right. The device B comprises a shaft 181 geared to the shaft 64 and mounted in a yoke 175 which is pivoted at 173, 174, Figs. 18 and 19, to a bracket 170 secured to the left-hand end of the carriage. When the platen is shifted the shaft 181 is tilted and moved axially, the yoke rocking to permit tilting of the shaft. The shaft 181 is provided with a pinion 196 for engaging racks 117, 121a on the plate 93 and slide 121. The pinion engages a pawl 205 on a rocking block 197 abutting on a rocking arm 209 operated by a pin 164 on a member 163 secured to the plate 93. A bail 221 pivoted at 217 to the bracket 170 has an arm 216 normally abutting on a pin 219, and is provided with a roller 222 and lugs 223, 224 co-operating with a rail 112 on the plate 93, the detent 137, and the latch 102 respectively. A ratchet wheel 182 on the shaft 181 normally engages a dog 183 on a bell crank 191 having a roller 195 which co-operates with rails 168, 115 on the plate 93, and a rail 120 connected to the slide 121 to release the dog when the shaft is required to rotate. When the carriage moves towards the left, a lug 227 on the bracket 170 rocks idly the lever 149, the pin 164 rocks idly the arm 209, the lug 224 releases the latch 102, and the roller 222 depresses the plate 93 and slide 121 by riding on to the rail 112. During further movement of the carriage to the left, the roller holds down the plate and slide, and the pinion 196 is prevented from engaging the racks 117, 121a. When the typed line is of such length that the roller runs off the rail, the plate and slide are restored to normal position by the spring 109, and on return of the carriage the pinion engages the racks, and the feed-rollers 73 are rotated to effect blanking-feed of the web, the feed being equal to the length of a bill less one line-space. At the beginning of the movement, the roller 222 rides on to the rail 112 and rocks the bail 221, and when the pinion has run off the rack 121a the lug 223 releases the detent and thereby permits a spring to move the slide 121 one-line space towards the right. The pin 164 then engages the arm 209, and the pawl 205 operates the pinion and causes the feed-rollers to impart a single line-space movement to the web. The lug 227 then engages the lever 149 and causes the pawl 139 to restore the slide to normal position. If the typed line is not of full length, the roller 222 remains on the rail 112, and on return of the carriage line-spacing is effected by the pawl 205 but blanking-feed does not occur since the pinion is unable to engage the racks. Moreover, the detent is not released, so that movement of the slide by means of the pawl 137 reduces the effective length of the racks by one line-space. If a number of lines not of full length are typed, line-spacing without blanking-feed is effected and the effective length of the racks is reduced by one line-space each time the carriage is returned. When, however, the next line of full length is typed, the web receives a blanking- feed and line-spacing movement equal to the length of a bill less the number of line-spaces occupied by the typed lines. The member 163 carrying the pin 164 is adjusted vertically to adjust line-spacing, corresponding adjustment of the throw of the pawl 137 being effected by employing a longer or shorter lug 227. The members 115, 163 are adjusted laterally in accordance with the length of the line. To provide for a small blanking-feed, the number of teeth 117 on the plate is reduced, and the slide 121 is replaced by a pair of toothed slides arranged to be operated successively by the pawl 137. The plate 93 and slide 121 may be replaced by a polygonal rod which is formed on the faces with toothed parts of graded length and is turned step-by-step to cause successive faces to co-operate with the pinion 196. Back-spacing mechanism.-To prevent the pin 164 and lever 149 from co-operating with the arm 209 and lug 227 during back-spacing, the back-spacing key is arranged to displace the pin and lever.